package com.miles.filter;

import com.miles.pojo.User;
import com.miles.util.Constants;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SysFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
        throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        // 过滤器，从session中获取用户
        User user = (User)request.getSession().getAttribute(Constants.USER_SESSION);

        if (null == user) {
            response.sendRedirect(request.getContextPath() + "/error.jsp");
        } else {
            filterChain.doFilter(servletRequest, servletResponse);
        }

    }

    @Override
    public void destroy() {

    }
}
